Heat transfers and pressure drops for porous-ring turbulators in a circular pipe

Akansu S. O.

APPLIED ENERGY, cilt.83, sa.3, ss.280-298, 2006 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 83 Sayı: 3
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1016/j.apenergy.2005.02.003
  • Dergi Adı: APPLIED ENERGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.280-298
  • Anahtar Kelimeler: heat-transfer enhancement, porous ring, turbulent flow, CONVECTION HEAT, TURBULENT-FLOW, FORCED-CONVECTION, TRIANGULAR PRISM, ENHANCEMENT, VELOCITY, SURFACE, FIELD, WAVY
  • Erciyes Üniversitesi Adresli: Evet

Özet

A numerical heat-transfer and pressure-drop analysis is presented for porous rings inserted in a pipe at a distance L apart. A constant heat-flux is applied to the outer surface of the pipe. Numerical calculations are conducted with the Fluent 6.1.22 code, using the shear-stress transport (SST) k-omega model. Air is the fluid. The heat-transfer increase is analyzed for Reynolds numbers from 3 x 10(3) to 45 x 10(3). The porous-ring height is taken as H = 1 or 2 mm. The distance between two porous rings is 0.5D, D or 2D where D is the inside diameter of the pipe. An increase in L/D caused a decrease in heat-transfer. High Nusselt numbers were obtained when H/D and L/D ratios were 0.4 and 0.5, respectively, for a Reynold number of 45,000. The maximum Nusselt number occurred when L/D = 1 if H/D is selected as 0.2. (C) 2005 Elsevier Ltd. All rights reserved.